Specifications

6
OPTIONS AND ACCESSORIES
*Indicates a factory-installed option.
†Indicates a field-installed accessory.
ITEM OPTION* ACCESSORY†
Perfect Humidity™ Dehumidification Package
X
Integrated Economizer — Durablade
XX
Integrated Economizer — EconoMi$er (gear driven)
XX
EconoMi$er with Power Exhaust (Vertical Only)
X
Power Exhaust for EconoMi$er
X
High-Static Motor (except 150)
X
Hinged Access Panels
X
25% Manual Outdoor-Air Damper
XX
50% Manual Outdoor-Air Damper
X
Convenience Outlet
X
Unit Mounted Disconnect
X
Two-Position Damper (25% Open)
X
Two-Position Damper (100% Open)
X
Roof Curb (14 in.)
X
Roof Curb (24 in.)
X
Thru-the-Bottom Service Connections
X
Thermostat and Subbase
X
Light Commercial Thermostat
X
Light Commercial Thermidistat
X
Time Guard® II Control Circuit (3-Phase Units Only)
X
Motormaster® Low Ambient Control
X
Motormaster II Low Ambient Control
X
Motormaster IV Low Ambient Control
X
Accusensor™ II Enthalpy Control
X
Accusensor III Differential Enthalpy Sensor
X
Liquid Propane Conversion Kit
X
Flue Discharge Deflector
X
Flue-Hood Protector Assembly
X
Coil Guard Grille
X
Condenser Coil Hail Guard
X
Fan/Filter Status Switch
X
Corrosion Resistant Coils
X
BURNER SPUDS
(ORIFICES)
LOW AMBIENT CONTROLS
The 581B036-150 standard units are designed to operate in cooling at outdoor temperatures
down to 25 F. With accessory Motormaster control (condenser-fan speed modulation), or Motor-
master II control (condenser-fan cycling), units can operate at outdoor temperatures down to
–20 F. The head pressure controls, which mount in the condenser section, control the
condenser-fan motor to maintain correct condensing temperature.
TIME GUARD II CONTROL
Time Guard II Control automatically prevents compressor
from restarting for at least 5 minutes after a shutdown.
Field-installed accessory prevents short cycling of com-
pressor if thermostat is rapidly changed. Time Guard II
device mounts in the control compartment of unit. The
Time Guard II device is not required when a programma-
ble thermostat is applied.
MOTORMASTER I
MOTORMASTER II
LIQUID PROPANE CONVERSION KIT
Liquid propane conversion kit allows
the unit to utilize a liquid propane fuel
supply in areas where natural gas is
not available. (Kit shown is for
sizes 036-072.)